java获取系统开机时间

Runtime.getRuntime().exec来得到，

头疼，

上代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Test {

/**
* @param args
*/
public static void main(String[] args) throws Exception{
   System.out.println(Test.readSystemStartTime());
  
}
public static String readSystemStartTime() throws IOException, 
    InterruptedException { 
        Process process = Runtime.getRuntime().exec( 
            "cmd /c net statistics workstation"); 
        String startUpTime = ""; 
        BufferedReader bufferedReader = new BufferedReader( 
            new InputStreamReader(process.getInputStream())); 
        int i = 0; 
        String timeWith = ""; 
        while ((timeWith = bufferedReader.readLine()) != null) { 
           if (i == 3) { 
               System.out.println(timeWith); 
               startUpTime = timeWith; 
         } 
        i++; 
       } 
        process.waitFor(); 
        return startUpTime; 
} 
}